Malicious PDF — malware analysis report

Static analysis result for SHA-256 c648dcafb6a5dfee…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36808a966f546a89ac16679df7b1e38 SHA-1: 691fa0c5a5953b3553d124ecee716d9a700f1f0d SHA-256: c648dcafb6a5dfee4722695e46c81eb4809844bd4b1aeb3bed502a0a9118784a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=top+gun+online+stream+free PDF link annotation
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd1db8b17---99824584555.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140711329a52---munewezinadinibopale.pdfIn PDF document text
    • https://ms01bet.com/contents/files/tusepuwoz.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/80018349041.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/ritulimom.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/49063697628.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zotenedeja.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210909222824.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8049adbd9---9560246834.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/17116764933.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/41383595537.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/rimuxixe.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jilanovulepegufadipatiz.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/41702761138.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/8933427620.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/modenidep.pdfIn PDF document text
    • http://superbarter.sk/media/file/bumutewegezudizixipelibox.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1da98871f---66751311250.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/depavajujoxilajuka.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210908_71FD04D9A7F36D54.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/84780231420.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juwegoselisevetiwanofar.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/nawanoke.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 10764 bytes
SHA-256: f340ce67e9712b3cb2574bca71590e995e585fc46efa5667cae0eee27c0463b1
font_01_sfnt_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 16456 bytes
SHA-256: b02264794aae62ac44e644b1139de7a7a2293f077dbd5ddb6c8736dddc1600d9
font_02_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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